To configure IS-IS on a routing instance

Purpose

Routing instance IS-IS parameter values can differ from the IS-IS interface parameter values that are configured in To configure an IS-IS interface . Interface capabilities are compared to the router-wide capabilities to determine the type of level 1, level 2, and level 1 and 2 adjacencies that are set up between routers to exchange IS-IS routing information.

Steps
 
1 

Enable the IS-IS protocol on a routing instance, as described in To enable IS-IS on a routing instance .

2 

In the navigation tree Routing view, expand Network→NE→Routing Instance→ISIS Instances.

3 

Right-click on the ISIS Instances object and choose Create ISIS Instance, or right-click on an ISIS Instance object and choose Properties. The ISIS Site, Routing Instance, ISIS Instance (Create|Edit) form opens.

4 

Configure the required general IS-IS instance parameters.

A level 1 adjacency can be established when there is at least one area ID shared by this router and a neighboring router. A level 2 adjacency is established when another router is configured as a level 2 or a level 1 and 2 router with interfaces configured as level 2 or level 1 and 2. A level 1 and 2 adjacency is created when the neighboring router is also configured as a level 1 and 2 router and the routers have at least one area ID in common.

5 

Click on the Behavior tab and configure the required parameters in the General panel.

Note the following:

  • You can configure the IPv6 Unicast Multi-Topology parameter only when the Multi-Topology parameter is set to true.

  • If you plan to enable IPv6 on the IS-IS instance (see Step 8 ), you must set the Multi-Topology and IPv6 Unicast Multi-Topology parameters to true.

  • You can configure the IID TLV parameter only when the L1 MAC Address and L2 MAC Address parameters are modified from the default values.

6 

Click on the LFA tab to configure the required Loop-free Alternates parameters.

Remote loop-free alternate uses segment routing by default. To configure segment routing, see To configure IS-IS segment routing.

7 

Configure the required parameters on the Graceful Restart tab.

8 

Configure the required parameters to specify the allowed IP versions for the IS-IS instance on the IP Versions tab.

9 

Click Apply.

10 

Configure the authentication behavior:

Perform the following steps:

  1. Click on the Authentication tab and enable authentication.

  2. Specify the type of authentication and a key.

  3. Select an authentication key chain. See the NSP System Administrator Guide for information about how to create a key chain.

11 

Configure route preferences and authentication for level 1 or level 2:

Perform the following steps:

  1. Click on the Level 1 or Level 2 tab and configure the required parameters.

  2. Click on the Authentication tab and configure the required parameters.

12 

Select up to five routing policy statements on the Export Policies tab.

You can specify multiple routing policies, in order of preference, to determine the routes that are exported from the routing table to IS-IS. When multiple policies are specified, the policies are evaluated in numerical order.

13 

Select up to five routing policy statements on the Import Policies tab.

You can specify multiple routing policies, in order of preference, to determine the routes that are imported to IS-IS. When multiple policies are specified, the policies are evaluated in numerical order.

14 

Select up to five loop-free alternate policy statements on the LFA tab.

15 

Configure participation in one or more flexible algorithms as needed:

  1. Click on the Flexible Algorithms tab.

  2. Click Search to populate a list of flexible algorithms.

  3. Choose a flexible algorithm and click Properties, or click Create. The Flexible Algorithm (Create|Edit) form opens.

  4. Configure the Algorithm ID and Participate parameters.

  5. Select a local Flexible Algorithm Definition if needed.

  6. Click OK.

Repeat this step to add additional flexible algorithms as needed.

16 

Configure one or more IGP shortcuts as needed:

  1. Click on the IGP Shortcut tab.

  2. Choose a hop and click Properties. The IGP Shortcut Tunnel Next Hop (Edit) form opens.

  3. Configure the parameters.

  4. Click OK to close the form.

17 

Configure a NET address:

Perform the following steps:

  1. Click on the NET Addresses tab.

  2. Click Create and configure the Area ID parameter on the Area ID, ISIS Instance (Create) form.

  3. Save your changes and close the form.

18 

Configure a route summarization. IS-IS route summaries allow users to create aggregate IPv4 or IPv6 addresses that include multiple groups of IPv4 or IPv6 addresses for a specific IS-IS summary level. This can help reduce the size of the link state database and the routing table.

Perform the following steps:

  1. Click on the Route Summarizations tab and click Create. The Route Summarization (Create) form opens.

  2. Configure the required parameters.

  3. Save your changes and close the form.

19 

To add an IS-IS interface:

Perform the following steps:

  1. Click on the Interfaces tab and click Create. The ISIS Interface (Create) form opens.

  2. Select an interface in the Interface panel.

  3. Click OK and confirm.

  4. Perform Step 5 to Step 11 of To configure an IS-IS interface .

20 

Save your changes and close the form.

End of steps